ceph/src/common/ceph_crypto.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2010-2011 Dreamhost
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15 #include "common/config.h"
  16 #include "ceph_crypto.h"
  17
  18 #ifdef USE_CRYPTOPP
  19 void ceph::crypto::init(CephContext *cct)
  20 {
  21 }
  22
  23 void ceph::crypto::shutdown(bool)
  24 {
  25 }
  26
  27 // nothing
  28 ceph::crypto::HMACSHA1::~HMACSHA1()
  29 {
  30 }
  31
  32 ceph::crypto::HMACSHA256::~HMACSHA256()
  33 {
  34 }
  35
  36 #elif defined(USE_NSS)
  37
  38 // for SECMOD_RestartModules()
  39 #include <secmod.h>
  40 #include <nspr.h>
  41
  42 static pthread_mutex_t crypto_init_mutex = PTHREAD_MUTEX_INITIALIZER;
  43 static uint32_t crypto_refs = 0;
  44 static NSSInitContext *crypto_context = NULL;
  45 static pid_t crypto_init_pid = 0;
  46
  47 void ceph::crypto::init(CephContext *cct)
  48 {
  49   pid_t pid = getpid();
  50   pthread_mutex_lock(&crypto_init_mutex);
  51   if (crypto_init_pid != pid) {
  52     if (crypto_init_pid > 0) {
  53       SECMOD_RestartModules(PR_FALSE);
  54     }
  55     crypto_init_pid = pid;
  56   }
  57
  58   if (++crypto_refs == 1) {
  59     NSSInitParameters init_params;
  60     memset(&init_params, 0, sizeof(init_params));
  61     init_params.length = sizeof(init_params);
  62
  63     uint32_t flags = (NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
  64     if (cct->_conf->nss_db_path.empty()) {
  65       flags |= (NSS_INIT_NOCERTDB | NSS_INIT_NOMODDB);
  66     }
  67     crypto_context = NSS_InitContext(cct->_conf->nss_db_path.c_str(), "", "",
  68                                      SECMOD_DB, &init_params, flags);
  69   }
  70   pthread_mutex_unlock(&crypto_init_mutex);
  71   assert(crypto_context != NULL);
  72 }
  73
  74 void ceph::crypto::shutdown(bool shared)
  75 {
  76   pthread_mutex_lock(&crypto_init_mutex);
  77   assert(crypto_refs > 0);
  78   if (--crypto_refs == 0) {
  79     NSS_ShutdownContext(crypto_context);
  80     if (!shared) {
  81       PR_Cleanup();
  82     }
  83     crypto_context = NULL;
  84     crypto_init_pid = 0;
  85   }
  86   pthread_mutex_unlock(&crypto_init_mutex);
  87 }
  88
  89 ceph::crypto::HMAC::~HMAC()
  90 {
  91   PK11_DestroyContext(ctx, PR_TRUE);
  92   PK11_FreeSymKey(symkey);
  93   PK11_FreeSlot(slot);
  94 }
  95
  96 #else
  97 # error "No supported crypto implementation found."
  98 #endif